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Head strongly depressed and the
jaw prominently inferior. Dorsal 1-6 rays, Pectoral 1-7; Pelvics
6; Anal fin; 9. Maxillary barbells reach back to the adipose
fin. The occipital process is united to the nucal plate, and
the humeral process is small. Rather rare, confined to the deeper
and slow-moving parts of large rivers together with some Loricaria
and Potamotrygon. Its body shape and colour pattern
are perfectly adapted to the muddy bottom where they stay. Feeds
on benthic organisms and fish. The position of the eyes and
the shape of the mouth of this piscivorous fish give to its
stalking mode of hunting. Adults have a greyish colouration,
with a series of brown spots of which those on the flanks have
a black center. Juveniles are heavier spotted than the adults.